Angles and Congruence

These flashcards cover concepts related to angles, congruence, and various angle relationships as outlined in the lecture notes.

What is a ray in geometry?

A ray is the part of a line consisting of a point on the line, called the endpoint, together with all of the collinear points on one side of the endpoint.

What are opposite rays?

Two collinear rays with a common endpoint that form a straight angle measuring 180°.

What constitutes an angle?

An angle is formed by a pair of rays that have a common endpoint, called the vertex.

What is the definition of congruent angles?

Angles that have the same measure are congruent.

What is an angle bisector?

A ray or segment that divides an angle into two congruent parts.

What is a linear pair?

A linear pair is a pair of adjacent angles with noncommon sides that are opposite rays, and the sum of their measures is 180°.

What are complementary angles?

Two angles that add up to 90°.

What are supplementary angles?

Two angles that add up to 180°.

What is the significance of perpendicular lines?

Perpendicular lines intersect at right angles, forming four right angles.

What are adjacent angles?

Angles that lie in the same plane, have a common vertex, and a common side but no common interior points.